Servers are a step under supercomputers, because they don't focus on trying to solve one very complex problem, but try to solve many many similar smaller ones. An example of a server would be the computers that Wikipedia stores its encyclopedia on. Those computers have to go and find the page you're looking for and send it to you. In itself it's not a big task, but it becomes a job for a server when the computers have to go and find lots of pages for a lot of people and send them to the right place. Some servers, like the ones Google uses for something like Google Documents, have applications on them instead of just files, like Wikipedia. A server is a central computer that contains collections of data and programs. Also called a network server, this system allows all connected users to share and store electronic data and applications. Two important types of servers are file servers and application servers.